Jälleen lisätietoa elämän synnystä

En ehdi kunnollista avausta alkaa tekemään, mutta kopioin pääkohdat kahdesta uutisesta, jotka kertovat uusista tutkimuksista koskien elämän syntyä. Toisessa kerrotaan aineenvaihdunnan mahdollisesta spontaanista synnystä alkumeressä ennen varsinaista elämän syntyä ja toisessa on yhdistetty kaksi aikaisempaa hypoteesia ensimmäisten protosolujen muodostumisesta.

"The findings suggests that metabolism predates the origin of life and evolved through the chemical conditions that prevailed in the worlds earliest oceans.

"Our results show that reaction sequences that resemble two essential reaction cascades of metabolism, glycolysis and the pentose-phosphate pathways, could have occurred spontaneously in the earth's ancient oceans," says Dr. Markus Ralser at the Department of Biochemistry at the University of Cambridge and the National Institute for Medical Research, who led the study."

"These results indicate that the basic architecture of the modern metabolic network could have originated from the chemical and physical constraints that existed on the prebiotic Earth."

Ja toisesta uutisesta:

"Researchers at the University of Bristol have designed a chemical system that brings together alternative ideas on how primitive cells were formed on the early Earth to produce a new model of protocell organization. The work is described in an article published this week in Nature Chemistry."

"The team first prepared membrane-free droplets containing high concentrations of biomolecules such as adenosine triphosphate (ATP), ribonucleic acid (RNA) and a short or long polymer of the natural amino acid lysine, and then added low amounts of a fatty acid.

The concentration of the fatty acid was too low for the molecules to self-organize into vesicles, and instead they became attached to the surface of the droplets to produce a continuous organic membrane. In this way, the researchers were able to produce protocells that were both membrane-bounded and chemically enriched.

Professor Stephen Mann said: "This work could open up a new horizon in protocell research as it offers an integrated approach to the problem of how the first cells were formed and organized.

"Our new hybrid model can be easily developed towards more complex systems, and designed and tested for new types of functions."

Elämän syntyä ei siis vieläkään selvitetty, mutta minusta on jo täysin selvää, että elämän synnyn pitäminen yliluonnollisena tapahtumana vaati huomattavasti paljon enemmän uskoa, kuin pitää sitä luonnollisena prosessina.

http://phys.org/news/2014-04-metabolism-early-oceans-life.html

http://phys.org/news/2014-04-coated-droplets-hint-formation-early.html#nRlv